Child ToolTip ignores delay and timeout properties

import QtQuick 2.7
import QtQuick.Controls 2.0

Item {
    Button {
        text: '1234567890'
        width: 80
        height: 30
        x: 40
        y: 30
        hoverEnabled: true

        //ToolTip.delay: 1000
        //ToolTip.timeout: 5000
        //ToolTip.text: text
        //ToolTip.visible: hovered

        ToolTip {
            delay: 1000
            timeout: 5000
            text: parent.text
            visible: parent.hovered
        }
    }
}